<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Title</title>
  
    <style type="text/css">
      
      .progress-1 {
      width:120px;
      height:20px;
      background:
       linear-gradient(#000 0 0) 0/0% no-repeat
       #ddd;
      animation:p1 2s infinite linear;
    }
    @keyframes p1 {
        100% {background-size:100%}
    }
    </style>
</head>

<body>
    <div class="progress-1"></div>
 
  
    <script>


    </script>
</body>

</html>